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1200P40 (ON Semiconductor) : Total 16 Pages

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NCP1200
PWM Current−Mode
Controller for Low−Power
Universal Off−Line Supplies
Housed in SOIC−8 or PDIP−8 package, the NCP1200 represents a
major leap toward ultra−compact Switchmode Power Supplies. Due to
a novel concept, the circuit allows the implementation of a complete
offline battery charger or a standby SMPS with few external
components. Furthermore, an integrated output short−circuit
protection lets the designer build an extremely low−cost AC−DC wall
adapter associated with a simplified feedback scheme.
With an internal structure operating at a fixed 40 kHz, 60 kHz or
100 kHz, the controller drives low gate−charge switching devices like
an IGBT or a MOSFET thus requiring a very small operating power.
Due to current−mode control, the NCP1200 drastically simplifies the
design of reliable and cheap offline converters with extremely low
acoustic generation and inherent pulse−by−pulse control.
When the current setpoint falls below a given value, e.g. the output
power demand diminishes, the IC automatically enters the skip cycle
mode and provides excellent efficiency at light loads. Because this
occurs at low peak current, no acoustic noise takes place.
Finally, the IC is self−supplied from the DC rail, eliminating the
need of an auxiliary winding. This feature ensures operation in
presence of low output voltage or shorts.
Features
No Auxiliary Winding Operation
Internal Output Short−Circuit Protection
Extremely Low No−Load Standby Power
Current−Mode with Skip−Cycle Capability
Internal Leading Edge Blanking
250 mA Peak Current Source/Sink Capability
Internally Fixed Frequency at 40 kHz, 60 kHz and 100 kHz
Direct Optocoupler Connection
Built−in Frequency Jittering for Lower EMI
SPICE Models Available for TRANsient and AC Analysis
Internal Temperature Shutdown
Pb−Free Packages are Available
Typical Applications
AC−DC Adapters
Offline Battery Chargers
Auxiliary/Ancillary Power Supplies (USB, Appliances, TVs, etc.)
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8
1
8
1
SOIC−8
D SUFFIX
CASE 751
PDIP−8
P SUFFIX
CASE 626
MARKING
DIAGRAMS
8
200Dy
ALYW
1
8
1200Pxxx
AWL
YYWW
1
xxx = Device Code: 40, 60 or 100
y = Device Code:
4 for 40
6 for 60
1 for 100
A = Assembly Location
L = Wafer Lot
Y, YY = Year
W, WW = Work Week
PIN CONNECTIONS
Adj 1
FB 2
CS 3
GND 4
8 HV
7 NC
6 VCC
5 Drv
(Top View)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 14 of this data sheet.
© Semiconductor Components Industries, LLC, 2004
December, 2004 − Rev. 13
1
Publication Order Number:
NCP1200/D



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NCP1200
EMI
Filter
Universal Input
C3 +
10 mF
400 V
1 Adj HV 8
2 FB NC 7
3 CS VCC 6
4 GND Drv 5
*
D2
1N5819
M1
MTD1N60E
6.5 V @ 600 mA
+ C2
470 mF/10 V
Rf
470
C5
10 mF
+
Rsense
D8
5 V1
*Please refer to the application information section
Figure 1. Typical Application
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁPIN FUNCTION DESCRIPTION
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁPinNo. PinName
Function
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ1 Adj Adjust the Skipping Peak Current
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ2 FB Sets the Peak Current Setpoint
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ3 CS CurrentSenseInput
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ4 GND TheICGround
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ5 Drv DrivingPulses
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ6 VCC SuppliestheIC
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ7 NC NoConnection
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ8 HV GeneratestheVCCfromtheLine
Description
This pin lets you adjust the level at which the cycle skipping process takes
place.
By connecting an Optocoupler to this pin, the peak current setpoint is ad-
justed accordingly to the output power demand.
This pin senses the primary current and routes it to the internal comparator
via an L.E.B.
The driver’s output to an external MOSFET.
This pin is connected to an external bulk capacitor of typically 10 mF.
This un−connected pin ensures adequate creepage distance.
Connected to the high−voltage rail, this pin injects a constant current into
the VCC bulk capacitor.
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NCP1200
Adj 1
FB 2
Current 3
Sense
75.5 k
1.4 V
Skip Cycle
+ Comparator
Internal
VCC
29 k
HV Current
Source
UVLO
High and Low
Internal Regulator
250 ns
L.E.B.
40, 60 or
100 kHz
Clock
Q Flip−Flop
Set DCmax = 80% Q
Reset
8
HV
7 NC
6
VCC
Ground 4
8k
+ Vref
5.2 V
60 k
20 k
+
1V
Overload?
Fault Duration
±110 mA
5 Drv
Figure 2. Internal Circuit Architecture
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁMAXIMUM RATINGS
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁRating
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁPower Supply Voltage
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁThermal Resistance Junction−to−Air, PDIP−8 version
Thermal Resistance Junction−to−Air, SOIC version
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁMaximum Junction Temperature
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁTypical Temperature Shutdown
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁStorage Temperature Range
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁESD Capability, HBM Model (All Pins except VCC and HV)
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁESD Capability, Machine Model
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁMaximum Voltage on Pin 8 (HV), pin 6 (VCC) Grounded
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁMaximum Voltage on Pin 8 (HV), Pin 6 (VCC) Decoupled to Ground with 10 mF
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁMinimum Operating Voltage on Pin 8 (HV)
Symbol
VCC
RqJA
RqJA
TJmax
Tstg
Value
16
100
178
150
140
−60 to +150
2.0
200
450
500
30
Units
V
°C/W
°C
°C
kV
V
V
V
V
Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit
values (not normal operating conditions) and are not valid simultaneously. If these limits are exceeded, device functional operation is not implied,
damage may occur and reliability may be affected.
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NCP1200
ELECTRICAL CHARACTERISTICS (For typical values TJ = +25°C, for min/max values TJ = −25°C to +125°C, Max TJ = 150°C,
VCC= 11 V unless otherwise noted)
Rating
Pin Symbol Min Typ Max Unit
DYNAMIC SELF−SUPPLY (All Frequency Versions, Otherwise Noted)
VCC Increasing Level at Which the Current Source Turns−off
VCC Decreasing Level at Which the Current Source Turns−on
VCC Decreasing Level at Which the Latchoff Phase Ends
Internal IC Consumption, No Output Load on Pin 5
6 VCCOFF 10.3
6 VCCON
8.8
6 VCClatch
6 ICC1
11.4 12.5 V
9.8 11 V
6.3 − V
710 880 mA
Note 1
Internal IC Consumption, 1 nF Output Load on Pin 5, FSW = 40 kHz
6 ICC2
− 1.2 1.4 mA
Note 2
Internal IC Consumption, 1 nF Output Load on Pin 5, FSW = 60 kHz
6 ICC2
− 1.4 1.6 mA
Note 2
Internal IC Consumption, 1 nF Output Load on Pin 5, FSW = 100 kHz
6 ICC2
− 1.9 2.2 mA
Note 2
Internal IC Consumption, Latchoff Phase
INTERNAL CURRENT SOURCE
6 ICC3
− 350 − mA
High−voltage Current Source, VCC = 10 V
High−voltage Current Source, VCC = 0 V
DRIVE OUTPUT
8 IC1
8 IC2
2.8 4.0
− 4.9
− mA
− mA
Output Voltage Rise−time @ CL = 1 nF, 10−90% of Output Signal
Output Voltage Fall−time @ CL = 1 nF, 10−90% of Output Signal
Source Resistance (drive = 0, Vgate = VCCHMAX − 1 V)
Sink Resistance (drive = 11 V, Vgate = 1 V)
CURRENT COMPARATOR (Pin 5 Un−loaded)
5 Tr
5 Tf
5 ROH
5 ROL
− 67 − ns
− 28 − ns
27 40 61 W
5 12 25 W
Input Bias Current @ 1 V Input Level on Pin 3
Maximum internal Current Setpoint
Default Internal Current Setpoint for Skip Cycle Operation
Propagation Delay from Current Detection to Gate OFF State
Leading Edge Blanking Duration
INTERNAL OSCILLATOR (VCC = 11 V, Pin 5 Loaded by 1 kW)
Oscillation Frequency, 40 kHz Version
Oscillation Frequency, 60 kHz Version
Oscillation Frequency, 100 kHz Version
Built−in Frequency Jittering, FSW = 40 kHz
Built−in Frequency Jittering, FSW = 60 kHz
Built−in Frequency Jittering, FSW = 100 kHz
Maximum Duty Cycle
3 IIB
3 ILimit
3 ILskip
3 TDEL
3 TLEB
− fOSC
− fOSC
− fOSC
− fjitter
− fjitter
− fjitter
− Dmax
− 0.02 − mA
0.8 0.9 1.0 V
− 350 − mV
− 100 160 ns
− 230 − ns
36 42 48 kHz
52 61 70 kHz
86 103 116 kHz
− 300 − Hz/V
− 450 − Hz/V
− 620 − Hz/V
74 80 87 %
FEEDBACK SECTION (VCC = 11 V, Pin 5 Loaded by 1 kW)
Internal Pullup Resistor
2 Rup
− 8.0 − kW
Pin 3 to Current Setpoint Division Ratio
− Iratio
− 4.0 − −
SKIP CYCLE GENERATION
Default skip mode level
1 Vskip 1.1 1.4 1.6 V
Pin 1 internal output impedance
1. Max value @ TJ = −25°C.
2. Max value @ TJ = 25°C, please see characterization curves.
1 Zout − 25 − kW
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